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US3829280A Expired / Lapsed US ⏱️ 0.0 years remaining

Apparatus for the production of polyphase gypsum

Assignee: Rheinstahl AG
•
Filing: 1972-10-16
•
Granted: 1974-08-13
•
Expires: 1992-10-16
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Abstract

Abstract Gypsum is treated in a final burning cyclone which discharges into a conveyor which is arranged to feed to a discharge into a cooling line leading to a cooling cyclone. The cooling line is connected to a humidifier and may be operated with or without the humidifier. Material is also fed to the conveyor from a material bin located downstream of the final burning cyclone. A bypass is connected to the conveyor to feed directly from the discharge of the final burning cyclone into the cooling line. With the inventive method, polyphase gypsum with an adjustable setting behavior is produced by first heating gypsum to form a phase mixture of dihydrate, hemihydrate and anhydrites. The heating is carried out in a carrier gas burning plant with a burning gas temperature which is only slightly above the exit terminature of the burnt material and part of the anhydrite III, which is undesired in the end product, is then rehydrated to hemihydrate. The rehydration of anhydrite III is effected by introducing the phase mixture into a cooling air current having an absolute humidity which can be regulated to about 30 g/Nm3 depending on the portion of the anhydrite III.

Inventors

  • 👤 O Jenne
  • 👤 J Steinkuhl
  • 👤 O Wiechmann
  • 👤 G Reimann

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 10:49
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/46; C01F11/466; C04; C04B; C04B11/00; C04B11/02; C01P; C01P2004/00; C01P2004/54; C01P2004/60; C01P2004/61

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 104 words
An apparatus for producing polyphase gypsum, comprising at least one heating cyclone having a vertically extending heated material discharge pipe, means for supplying heating gases to said cyclone, a raw material storage bin for fine grained dihydrate material having a vertically extending dihydrate material discharge pipe extending substantially parallel to and spaced from said heated material discharge, a cooling conduit, a conveyor arranged below said heated material discharge pipe and solid dihydrate material discharge pipe and connected to said heated material discharge and to said fine grained material discharge at spaced locations in series and having a final discharge connected into said cooling conduit.
Claim 2
Independent Claim 104 words
An apparatus for producing polyphase gypsum, comprising at least one heating cyclone having a vertically extending heated material discharge pipe, means for supplying heating gases to said cyclone, a raw material storage bin for fine grained dihydrate material having a vertically extending dihydrate material discharge pipe extending substantially parallel to and spaced from said heated material discharge, a cooling conduit, a conveyor arranged below said heated material discharge pipe and solid dihydrate material discharge pipe and connected to said heated material discharge and to said fine grained material discharge at spaced locations in series and having a final discharge connected into said cooling conduit.
Claim 3
Dependent Claim 26 words
An apparatus for producing polyphase gypsum, according to claim 1, including a bypass connected to said heated material discharge and connecting directly into said cooling conduit.
Claim 4
Dependent Claim 86 words
An apparatus for producing polyphase gypsum, according to claim 1, including a first cooling cyclone connected to said cooling conduit and having a first cooling cyclone discharge, a second cooling cyclone connected to the discharge of said first cooling cyclone, a humidifier having an inlet for air connected to said cooling conduit and having a connection to said second cooling cyclone, and adjustable means in the connection to said second cooling cyclone for connecting and disconnecting said second cooling cyclone to the humidifier and to atmosphere.
Claim 5
Dependent Claim 55 words
An apparatus for producing polyphase gypsum, according to claim 3, wherein said first and second cooling cyclones have connections to a dust separator, the material treated in said first cooling cyclone being delivered to said second cooling cyclone, said second cooling cyclone discharging into a delivery conduit which is also connected to said dust separator.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-08-12 1978-02-11 1978-08-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-08-12 1982-02-11 1982-08-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-08-12 1986-02-11 1986-08-13 $7700.00 Window Closed / Lapsed

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